Just my thought here, but If going to go to a genoa, I would do 130% or less with your ketch rig.
Also, sail shape is very important. With your 35 you are wanting a power sail shape rather than speed sail shape. The deeper the pocket (assuming it’s in the right place) the more power you get. the more shallow the pocket the more speed, but you loose the power. Your Endurance is probably displacing 19,000+lbs and Hull speed is 7-8 knots I’m guessing. I would make sure your new sail is set for a power draft. That will help move the weight of the boat better through chop and swell
I used to race Hobie 16’s and it taught me a lot about sail shape and tuning.
Best of Luck!